CN211288562U

CN211288562U - Bearing type motion decoupling vertical vibration isolation device

Info

Publication number: CN211288562U
Application number: CN201922203750.XU
Authority: CN
Inventors: 周颖; 陈鹏; 刘浩
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-08-18
Anticipated expiration: 2029-12-05

Abstract

A bearing type motion decoupling vertical vibration isolation device is characterized by comprising a vertical vibration isolation mechanism, a connecting and fixing mechanism, an anti-instability mechanism, a positioning mechanism and a motion decoupling mechanism; the vertical vibration isolation mechanism is a core mechanism which is positioned at the central position of the whole device and is responsible for providing vertical self-adaptive rigidity characteristics required by vibration isolation; the whole device plays the role of connection and bearing through the connecting and fixing mechanism, the top and the bottom of the connecting and fixing mechanism are respectively fixed on the structure, and the top and the bottom of the connecting and fixing mechanism and the vertical vibration isolation mechanism positioned in the middle realize the transmission and bearing of vertical force; the anti-instability mechanism and the positioning mechanism are arranged around the elastic element in the vertical vibration isolation mechanism and are matched with each other to ensure the stability of the performance of the vertical vibration isolation mechanism; the waist of the whole device is provided with a motion decoupling mechanism which is matched with the connecting and fixing mechanism to realize the decoupling of vertical motion and horizontal motion. The instability and eccentricity problems of the vertical vibration isolation system are comprehensively solved.

Description

Bearing type motion decoupling vertical vibration isolation device

Technical Field

The application relates to a bearing type motion decoupling vertical vibration isolation device, and belongs to the field of vibration and noise control.

Background

The vibration isolation technology belongs to a passive vibration control technology. In the last 70 years, the vibration isolation technology is continuously developed, and the vibration isolation technology has been widely researched and applied in the fields of mechanical equipment vibration control and building structure earthquake resistance. The basic principle of vibration isolation is that a vibration isolation layer with low horizontal rigidity is formed by arranging a vibration isolation support and other structures between an object to be subjected to vibration isolation and a foundation, and the influence of external environment vibration, earthquake and the like on the vibration isolation object is reduced through a filtering effect, or the vibration isolation object is prevented from generating vibration and transmitting the vibration to the ground.

The existing vibration isolation device cannot meet the requirements of various types of vibration isolation. Many precision instruments and equipment, as well as important historical cultural relics and the like, need to simultaneously consider the isolation of seismic action and the vibration of the surrounding environment, and the characteristics of earthquake, mechanical vibration and the like are quite different. The earthquake has the characteristics of high amplitude, wide frequency spectrum and low frequency; and the mechanical vibration has the characteristics of low amplitude, narrow frequency spectrum and high frequency. The traditional vibration isolation device is difficult to meet the requirement of optimizing the isolation of two types of vibration sources. In addition, some existing devices with three-way vibration isolation function have the defects of serious vertical and horizontal mechanical property coupling, poor vibration isolation effect and the like.

Chinese patent application 2019107633608 discloses a bearing type motion decoupling three-dimensional vibration isolation support which has good vibration isolation effect on various vibration sources and horizontal and vertical multi-dimensional vibration input. The technical scheme is as follows: a bearing type motion decoupling three-dimensional vibration isolation support comprises an upper connecting plate, a middle working plate, a lower connecting plate, a horizontal vibration isolation system, a vertical vibration isolation system, a linear bearing and a bearing guide rod. The horizontal vibration isolation system is arranged between the upper connecting plate and the middle connecting plate, and the vertical vibration isolation system is arranged between the middle connecting plate and the lower connecting plate; the horizontal vibration isolation system adopts a laminated rubber support and plays a vibration isolation role through horizontal deformation; the vertical vibration isolation system adopts a device with self-adaption rigidity, which is composed of a disc spring, a spiral spring and a positioning loading ring, and plays a role in vibration isolation through vertical deformation; the linear bearing and the bearing guide rod are arranged between the middle working plate and the lower connecting plate to realize the horizontal and vertical motion decoupling of the bearing type motion decoupling three-dimensional vibration isolation support.

The vertical vibration isolation system in the patent application 2019107633608 bearing type motion decoupling three-dimensional vibration isolation support is a device with self-adaptive rigidity, and comprises a disk spring, a spiral spring and a positioning loading ring; the positioning loading ring comprises a bottom positioning loading ring, an inner positioning loading ring and an outer positioning loading ring; the outer positioning loading ring and the bottom positioning loading ring are sequentially arranged between the middle working plate and the lower connecting plate from top to bottom; two or more disc springs are sequentially arranged between the outer positioning loading ring and the bottom positioning loading ring from top to bottom, and two adjacent disc springs are connected in series through one inner positioning loading ring respectively and transmit force through the inner positioning loading ring; the spiral spring is positioned between the middle working plate and the lower connecting plate, and sequentially passes through the outer positioning loading ring, the disc spring connected in series through the inner positioning loading ring and the bottom positioning loading ring. The disc springs connected in series provide negative stiffness, the spiral springs provide positive stiffness, and the stiffness of the device is close to zero near the flattening position of the disc springs, so that a lower initial vibration isolation frequency is obtained.

Disclosure of Invention

The utility model provides an aim at overcome prior art not enough, further research and development discloses a vertical vibration isolation device of novel bearing formula motion decoupling zero, synthesizes unstability, the eccentric problem that has comprehensively solved vertical vibration isolation system and appears, the method thinking that gives for this application: by means of combined typesAnti-instability mechanismThe stability of the spiral spring is ensured while the vertical deformation capacity is not influenced; by co-operation with anti-destabilizing meansAnti-deformation positioning loading ringDesigning to ensure the centering of the centroid of the disc spring assembly; by passingBearing assembly Design of sleeveThe device has the advantages of saving space, simplifying installation, ensuring that the whole device can only generate low-friction motion in the vertical direction, playing a role in motion decoupling and ensuring the shock insulation/vibration of the deviceThe effect of the effect.

Technical scheme

A bearing type motion decoupling vertical vibration isolation device is characterized by comprising a vertical vibration isolation mechanism, a connecting and fixing mechanism, an anti-instability mechanism, a positioning mechanism and a motion decoupling mechanism; the vertical vibration isolation mechanism is a core mechanism which is positioned at the central position of the whole device and is responsible for providing vertical self-adaptive rigidity characteristics required by vibration isolation; the whole device plays the role of connection and bearing through the connecting and fixing mechanism, the top and the bottom of the connecting and fixing mechanism are respectively fixed on the structure, and the top and the bottom of the connecting and fixing mechanism and the vertical vibration isolation mechanism positioned in the middle realize the transmission and bearing of vertical force; the anti-instability mechanism and the positioning mechanism are arranged around the elastic element in the vertical vibration isolation mechanism and are matched with each other to ensure the stability of the performance of the vertical vibration isolation mechanism; the waist of the whole device is provided with a motion decoupling mechanism which is matched with the connecting and fixing mechanism to realize the decoupling of vertical motion and horizontal motion.

The vertical vibration isolation mechanism is a vertical vibration isolation device with rigidity self-adaptive characteristics and comprises a disc spring 9 and a spiral spring 8; a plurality of disc springs 9 are connected in series to form a disc spring group, and a spiral spring 8 is arranged at the central axis of the disc spring group and is in parallel connection with the disc spring group; when the disc spring group is near the flattening position, nonlinear negative stiffness can be provided and is connected with the spiral spring 8 with linear positive stiffness in parallel, and nonlinear self-adaptive stiffness is generated.

The connecting and fixing mechanism sequentially comprises an upper connecting plate 12, an inner sleeve 4, a lower connecting plate 1, an outer sleeve 3 and a bottom plate 13 from top to bottom, wherein the upper connecting plate 12 is connected with a structure of a to-be-isolated body through bolts, the inner sleeve 4 is fixed on the upper connecting plate 12 through bolts, the outer sleeve 3 is fixed on the bottom plate 13 through bolts, and the bottom plate 13 is connected with a foundation through bolts; the outer diameter of the inner sleeve 4 is smaller than the inner diameter of the outer sleeve 3. The gravity of the vibration-isolated body is transmitted to the vertical vibration isolation mechanism through the upper connecting plate 12 and the inner sleeve 4, and then transmitted to the foundation through the bottom plate 13.

The anti-instability mechanism comprises an anti-instability upper rod 10 and an anti-instability lower rod 11, wherein the anti-instability upper rod 10 is fixed on the inner sleeve 4 through threads, and the anti-instability lower rod 11 is fixed on the outer sleeve 3 through threads; the top of the upper instability preventing rod 10 and the bottom of the lower instability preventing rod 11 are respectively a full circle with the same radius, and the rod walls of the upper instability preventing rod and the lower instability preventing rod are in a complementary relation, namely the upper instability preventing rod and the lower instability preventing rod can form a full circle after being spliced and inserted, and form a hollow rod-shaped vertical telescopic mechanism. The upper and lower rod spaces of the instability-proof mechanism are internally used for arranging the spiral spring 8 in the vertical vibration isolation mechanism, so that the lateral instability of the instability-proof mechanism under the pressure working state is avoided.

The positioning mechanism comprises a bottom positioning loading ring 5, an inner positioning loading ring 6 and an outer positioning loading ring 7, wherein the bottom positioning loading ring 5 is arranged at the bottom of the outer sleeve 3, the inner positioning loading ring 6 is positioned between two disc springs 9 with adjacent inner diameters, and the outer positioning loading ring 7 is used between two disc springs 9 with adjacent outer diameters. The inner diameter of each positioning loading ring is the same as the outer diameter of the anti-destabilization mechanism, namely the hollow rod, and the two mechanisms are matched with each other to realize the accurate centering of the positioning loading rings, correct the position of the disc spring 9 in the vertical vibration isolation mechanism, and play the roles of positioning the disc spring and providing a deformation space.

The motion decoupling mechanism comprises a linear bearing 2 and a ball 14, wherein the linear bearing 2 is fixed on the lower connecting plate 1 through a bolt; when the device is subjected to vertical relative displacement, the inner sleeve 4 moves in the linear bearing 2, rolling friction is generated between the balls 14 in the bearing and the inner sleeve 4, the inner sleeve 4 is guaranteed to do low-friction linear motion in the bearing, and horizontal and vertical motion decoupling is realized.

The utility model discloses the obvious effect that the vertical vibration isolation device of bearing formula motion decoupling zero can realize is promoted and is:

(1) the combined design based on the anti-instability mechanism avoids the lateral instability phenomenon of the vertical vibration isolation mechanism under the state that the spiral spring is pressed, and ensures the stability of the vertical vibration isolation mechanism.

(2) Based on the matching design of the anti-instability mechanism and the positioning mechanism, the precise installation of the positioning loading ring is realized, the centering precision of the disc spring is optimized, and the working performance of a vertical vibration isolation system is ensured;

(3) based on the matching design of the motion decoupling mechanism and the connecting and fixing mechanism, the decoupling of the vertical motion and the horizontal motion of the system is smoothly realized, and the installation condition is simplified.

Drawings

FIG. 1 is a cross-sectional view of the apparatus of the present application;

FIG. 2 is a perspective assembly view of the present application;

FIG. 3 is a cross-sectional view of the decoupling assembly;

FIG. 4 is a schematic view of the anti-destabilizing rod fit;

FIG. 5 is a schematic diagram of the series 2 groups of disk spring loaded packs;

reference numbers in the figures: the device comprises a lower connecting plate 1, a linear bearing 2, an outer sleeve 3, an inner sleeve 4, a bottom positioning loading ring 5, an inner positioning loading ring 6, an outer positioning loading ring 7, a spiral spring 8, a disk spring 9, an upper instability preventing rod 10, a lower instability preventing rod 11, an upper connecting plate 12, a bottom plate 13 and balls 14.

Detailed Description

The present application will be further described with reference to the following examples shown in the drawings.

As shown in fig. 1, the present application includes: vertical vibration isolation mechanism, connection fixed establishment, anti-destabilization mechanism, positioning mechanism, motion decoupling mechanism. The vertical vibration isolation mechanism is a core mechanism which is positioned at the central position of the whole device and is responsible for providing vertical self-adaptive rigidity characteristics required by vibration isolation; the whole device plays the role of connection and bearing through the connecting and fixing mechanism, the top and the bottom of the connecting and fixing mechanism are respectively fixed on the structure, and the top and the bottom of the connecting and fixing mechanism and the vertical vibration isolation mechanism positioned in the middle realize the transmission and bearing of vertical force; the anti-instability mechanism and the positioning mechanism are arranged around the elastic element in the vertical vibration isolation mechanism and are matched with each other to ensure the stability of the performance of the vertical vibration isolation mechanism; the waist of the whole device is provided with a motion decoupling mechanism which is matched with the connecting and fixing mechanism to realize the decoupling of vertical motion and horizontal motion.

The vertical vibration isolation mechanism comprises a vertical vibration isolation device with rigidity self-adaptive characteristic, which is composed of a disc spring 9 and a spiral spring 8. A plurality of disc springs 9 are connected in series to form a disc spring group, and a spiral spring 8 is arranged at the central axis of the disc spring group and is in parallel connection with the disc spring group; when the disc spring group is near the flattening position, nonlinear negative stiffness can be provided and is connected with the spiral spring 8 with linear positive stiffness in parallel, and nonlinear self-adaptive stiffness is generated. The rigidity self-adaptation means that when the vertical vibration displacement of the support is small, the system provides small rigidity, and the vibration isolation initial frequency is reduced; when the vibration displacement is large, the rigidity is high, and the system failure caused by overlarge displacement is avoided.

The connecting and fixing mechanism sequentially comprises an upper connecting plate 12, an inner sleeve 4, a lower connecting plate 1, an outer sleeve 3 and a bottom plate 13 from top to bottom, wherein the upper connecting plate 12 is connected with a structure of a to-be-isolated body through bolts, the inner sleeve 4 is fixed on the upper connecting plate 12 through bolts, the outer sleeve 3 is fixed on the bottom plate 13 through bolts, and the bottom plate 13 is connected with a foundation through bolts; the outer diameter of the inner sleeve 4 is smaller than the inner diameter of the outer sleeve 3. The gravity of the vibration-isolated body is transmitted to the vertical vibration isolation mechanism through the upper connecting plate 12 and the inner sleeve 4, and then transmitted to the foundation through the bottom plate 13. The anti-instability mechanism comprises an anti-instability upper rod 10 and an anti-instability lower rod 11, wherein the anti-instability upper rod 10 is fixed on the inner sleeve 4 through threads, and the anti-instability lower rod 11 is fixed on the outer sleeve 3 through threads; the top of the upper instability preventing rod 10 and the bottom of the lower instability preventing rod 11 are respectively a full circle with the same radius, and the rod walls of the upper instability preventing rod and the lower instability preventing rod are in a complementary relation, namely the upper instability preventing rod and the lower instability preventing rod can form a full circle after being spliced and inserted, and form a hollow rod-shaped vertical telescopic mechanism. The upper and lower rod spaces of the instability-preventing mechanism are used for accommodating the spiral spring 8 in the vertical vibration isolation mechanism, so that the lateral instability of the instability-preventing mechanism under a pressed working state is avoided, and the lateral stability of the linear positive-stiffness spiral spring 8 vibration isolation component in the vertical vibration isolation mechanism is guaranteed.

The positioning mechanism comprises a bottom positioning loading ring 5, an inner positioning loading ring 6 and an outer positioning loading ring 7, wherein the bottom positioning loading ring 5 is arranged at the bottom of the outer sleeve 3, the inner positioning loading ring 6 is positioned between two disc springs 9 with adjacent inner diameters, and the outer positioning loading ring 7 is used between two disc springs 9 with adjacent outer diameters. The inner diameter of each positioning loading ring is the same as the outer diameter of the anti-destabilization mechanism, namely the hollow rod, and the two mechanisms are matched with each other to realize the accurate centering of the positioning loading rings, further correct the position of the disc spring 9 in the vertical vibration isolation mechanism and play roles in positioning the disc spring and providing a deformation space.

The motion decoupling mechanism comprises a linear bearing 2 and a ball 14, wherein the linear bearing 2 is fixed on the lower connecting plate 1 through a bolt. When the device is subjected to vertical relative displacement, the inner sleeve 4 moves in the linear bearing 2, rolling friction is generated between the balls 14 in the bearing and the inner sleeve 4, the inner sleeve 4 is guaranteed to do low-friction linear motion in the bearing, and horizontal and vertical motion decoupling is realized. Fig. 3 is a cross-sectional view of the decoupling assembly. The horizontal motion and the vertical motion are decoupled, so that on one hand, the working condition of the vertical vibration isolation system is optimized, and the design process is simplified; on the other hand, the phenomenon that the vibration-isolated body is swung and overturned due to the fact that the vibration isolation layer has an overlarge rotating angle under the vibration excitation condition is effectively avoided.

Fig. 2 is a perspective assembly view of the present application illustrating the mating relationship between the components.

Fig. 4 is a schematic view of the anti-destabilizing rod. The combined instability-proof rod is adopted to prevent the instability of the spiral spring. When the device works, the two rod limbs are staggered, so that a vertical deformation space can be ensured; meanwhile, the outer diameter and the inner diameter of the inner positioning loading ring and the outer positioning loading ring are different, the deformation resistance is ensured to be strong, and meanwhile, the inner positioning loading ring and the outer positioning loading ring can be matched with the anti-instability rod to position the inner positioning loading ring and the disc spring during installation so as to ensure uniform stress.

The belleville springs 8 of fig. 5 are connected in series by cooperating with the inner and outer positioning and loading rings to enhance the deformability of the vertical vibration isolation system. The inner positioning loading ring 5 and the outer positioning loading ring 6 have the same inner diameter, are convenient to calibrate by matching with an instability-preventing rod during installation, and play roles in transferring force, fixing the disc spring 8 and providing larger deformation capacity for the disc spring 8.

Claims

1. A bearing type motion decoupling vertical vibration isolation device is characterized by comprising a vertical vibration isolation mechanism, a connecting and fixing mechanism, an anti-instability mechanism, a positioning mechanism and a motion decoupling mechanism; the vertical vibration isolation mechanism is a core mechanism which is positioned at the central position of the whole device and is responsible for providing vertical self-adaptive rigidity characteristics required by vibration isolation; the whole device plays the role of connection and bearing through the connecting and fixing mechanism, the top and the bottom of the connecting and fixing mechanism are respectively fixed on the structure, and the top and the bottom of the connecting and fixing mechanism and the vertical vibration isolation mechanism positioned in the middle realize the transmission and bearing of vertical force; the anti-instability mechanism and the positioning mechanism are arranged around the elastic element in the vertical vibration isolation mechanism and are matched with each other to ensure the stability of the performance of the vertical vibration isolation mechanism; the waist of the whole device is provided with a motion decoupling mechanism which is matched with the connecting and fixing mechanism to realize the decoupling of vertical motion and horizontal motion.

2. The bearing-type motion decoupling vertical vibration isolation device according to claim 1, wherein the vertical vibration isolation mechanism is a vertical vibration isolation device with stiffness adaptive characteristics, and comprises a disc spring (9) and a spiral spring (8); a plurality of disc springs (9) are connected in series to form a disc spring group, and a spiral spring (8) is arranged at the central axis of the disc spring group and is in parallel connection with the disc spring group; when the disc spring group is near the flattening position, nonlinear negative stiffness can be provided and is connected with the spiral spring (8) with linear positive stiffness in parallel, and nonlinear adaptive stiffness is generated.

3. The bearing type motion decoupling vertical vibration isolation device as claimed in claim 1, wherein the connection fixing mechanism comprises an upper connecting plate (12), an inner sleeve (4), a lower connecting plate (1), an outer sleeve (3) and a bottom plate (13) from top to bottom in sequence, the upper connecting plate (12) is connected with the structure of the vibration-isolated body through bolts, the inner sleeve (4) is fixed on the upper connecting plate (12) through bolts, the outer sleeve (3) is fixed on the bottom plate (13) through bolts, and the bottom plate (13) is connected with the foundation through bolts; the outer diameter of the inner sleeve (4) is smaller than the inner diameter of the outer sleeve (3); the gravity of the vibration-isolated body is transmitted to the vertical vibration isolation mechanism through the upper connecting plate (12) and the inner sleeve (4) and then transmitted to the foundation through the bottom plate (13).

4. The bearing-type motion decoupling vertical vibration isolation device according to claim 1, wherein the anti-instability mechanism comprises an anti-instability upper rod (10) and an anti-instability lower rod (11), the anti-instability upper rod (10) is fixed to the inner sleeve (4) through threads, and the anti-instability lower rod (11) is fixed to the outer sleeve (3) through threads; the top of the anti-instability upper rod (10) and the bottom of the anti-instability lower rod (11) are respectively a whole circle with the same radius, and the rod walls of the anti-instability upper rod and the anti-instability lower rod are in a complementary relation, namely the anti-instability upper rod and the anti-instability lower rod can form a whole circle after being spliced and inserted and form a hollow rod-shaped vertical telescopic mechanism; the upper and lower rod spaces of the instability-proof mechanism are internally used for arranging a spiral spring (8) in the vertical vibration isolation mechanism, so that the lateral instability of the instability-proof mechanism under a pressed working state is avoided.

5. The bearing-type motion-decoupling vertical vibration isolation device according to claim 1, wherein the positioning mechanism comprises a bottom positioning loading ring (5), an inner positioning loading ring (6) and an outer positioning loading ring (7), the bottom positioning loading ring (5) is arranged at the bottom of the outer sleeve (3), the inner positioning loading ring (6) is arranged between two belleville springs (9) with adjacent inner diameters, and the outer positioning loading ring (7) is arranged between two belleville springs (9) with adjacent outer diameters; the inner diameter of each positioning loading ring is the same as the outer diameter of the anti-destabilization mechanism, namely a hollow rod, and the two mechanisms are matched with each other to realize the accurate centering of the positioning loading rings, correct the position of the disc spring (9) in the vertical vibration isolation mechanism and play roles in positioning the disc spring and providing a deformation space.

6. The bearing-type motion-decoupling vertical vibration isolator according to claim 1, characterized in that said motion-decoupling mechanism comprises a linear bearing (2) and a ball (14), said linear bearing (2) being fixed to the lower connecting plate (1) by means of a bolt; when the device is vertically displaced relatively, the inner sleeve (4) moves in the linear bearing (2), rolling friction is formed between the balls (14) in the bearing and the inner sleeve (4), the inner sleeve (4) is guaranteed to do low-friction linear motion in the bearing, and horizontal and vertical motion decoupling is achieved.